Adhesive



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of condensation products of urea, thiourea or derivatives thereof. andaldehydes, icularly formaldehyde or more thereof it necessary orrequired with the use of hardening agents for 20 these condetiofiproducts, such as adds, acid salts or substances which split on acids.

, As a resultof further investigation and research it has been found inaccordance with the present invention that the technical wesiveproperties of the above mentioned adhesives oi urea-aldehydecondensation products a, be considerably enhanced by the presencetherein oi phenol-aldehyde condor tion products capable oi hardening.The phenol-aldehyde condetion. products can be incorated as such in ater-soluble or 1 ii? state with the adhesivw. it is, how

ever, prefers? to incorporate the individual components, that is to saythe phenol and aldehyde separately with the adhesive before-the applica-35 tion of the same; the formation of the phenolaldehyde condensationproduct then proceeds in the adhesive mixture. It is eslly recommendedthat the urea-aldehyde condensation products be employed in the form ofthe solutions obtainable in accordance with German Patent 550,647 of May14, 1932.

Among the compounds which are suitable as hardening. agents fortheurea-aldehyde con densation products may be mentioned acids, such ashydrochloric acid, sulphuric acid, phosphoric acid. acetic acid, oxalicacid, lactic acid, acid salts, such as for example, acid sodiumsulphate, ammonium, phosphate and aluminum chloride, as

- well as substances, which split oil acids on incorporation with theadhesive mixture. such as for example, ammonium chloride and ammoniumsulphate. I

- Among the" phenols adapted for use as components of the phenolaldehyde condensation T 55 products may be mentioned: phenols, such ao-imode a p u in? MEGS! f n Kit is who i'iiiiliiiifil in am. one es mi.ilomeio m minions ,eh'eiiehisss .sneiri. .zii: muted a m M Adolf um,Krefold-Uordingon,

, slgnor, memo llollnmontsl to g V Company, Incorporated, Toledo, Ohio,a cornotation of Delaware No Drawing. Application January 9, 1935, So-

rlol No. 1,069. InGormony January 16, 1934 v t 3- claims. (Cl. 260-28)The present invention relatesto the manufacphenol itself,cresol,"xylenol, naphthol and dihyture of adhesives comprisingwater-soluble-ureadroxydlnhenylmethane, as w l as homolosues aldehydecondensation products, having incor-- thereof, such as for example,those obtainable by porated therewith a phenol and an aldehyde oracondensing phenols with aldehydes or ketones. J condensation productderived from a phenol and Particularly valuable for the production ofthe 5 an aldehyde. adhesives embraced by this invention arev poly- Theobject of the present invention is the valentphenols,especiallyresorcinol,aswell as also manufacture of an adhesive forgluelng or cepyrocatechine, hydroquinone, pyrogallol, oxyhymentingtogether working or construction matedroquinone and phloroglucine. Amongthe aidem rials of' all kinds, such as, for example, paste-- hydecomponents of the phenol aldehyde conboard, vulc fibre, textiles as wellas leather 1'--..- tion products may be mentioned, formaldewith wood andin particular for cementing wood. hvde and P y r h flf. as Well asacetalde- It is known to glue or cement wood pieces tohyde. paraldehyde,crotonic aldehyde, furfural gether particularly in iorming'ply-wood andand the like. is furniture wood by employing ueoussolutions With theadhesives one may incorporate, if

ry or desired, additions known in the adhesive industry, such as forexample, starch, potato meal, ground potato flakes or fillers of themost varied kinds.

"The application of the adhesives is carried out go in the manner mownfor cementing or glueing together pieces of materials by means ofadhesives derived from urea-aldehyde condensation proddots, that is tosay, the adhesive solution, after the addition of a hardening agent ifnecessary or red, is applied to the'surfaces to be cemented together. ematerials thus prepared are thenpressed together and if necessary orrequired an eleva temperature of working may be resorted to. For somepurposes it may be of advantage to so carry out the cementing of thepieces in such a v... nner that the adhesive and the hardening agentsare applied separately to the surfaces to be cemented together, thepieces thereupon being placed in contact and subjected to pressure.

The bonds obtained, especially between wooden pieces, by means of theadhesives obtainable in accordance with the present invention areparticularly distinguished by a very high resistance towater, which canbe increased-to such an extent 40 especially by the use of polyphenolsthat the bonds remain stable even towards the prolonged action ofboiling water.

The invention is illustrated, but not restricted by the followingexample.

. m 200 parts by weight of a 30% aqueous solution of formaldehyde areheated to 95 C. with 0.1 of one part by weight of monosodiumphosphate. A

'solution'heated to 70 C. and consisting of parts .by weight of urea in30 parts of water is then .veneer are then laid on and pressed for 10minutes at about 100 0. Die resulting cemented material is stabletowards boiling water.

Iclaim:

' l. A method of preparing and applying an adhesive that comprisesbringing together a ureaiormaldehyde condensation product, a hardeningagent therefor, and a polyhydric phenol in an aqueous solutioncontaining free formaldehyde, and anpiyingthe resulting adhesive beforeit hardens.

2. A method of preparing and applying an adhesive that comprisesbringing together a ureatormaldehyde condensation product, a hardeningagent therefor, and resorcinolin an aqueous solution containing ireeformaldehyde, and applying the resulting adhesive before it hardens.

8. A method of preparing and applying an adhesive that comprisesbringing together about 85 parts by weight of a urea-formaldehydecondensation product, ammonium chloride, and 20 parts by weight orresorcinol, in an aqueous solution containing tree formaldehyde, andapplying the resulting adhesive before it hardens.

ADOLI' MERGER.

